Here is the full list of all 60 Littlewood achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Find all Tarott Monster cards.
Complete all Personal Goals.
Complete 150 quests.
Donate all items to Museum.
Visit the Edge of Solemn.
Catch 2500 fish.
Unlock all town wishes.
Get Married.
Mine 6000 ores.
Unlock all ultimate upgrades at the Crafting Workshop.
Chop 6000 trees.
Gather 4000 items.
Catch 2500 bugs.
Discover All Tavern Recipes.
Harvest 4000 crops.
Complete 100 quests.
Adopt a pet.
Mine 3500 ores.
Chop 3500 trees.
Upgrade all structures and areas to 10 stars.
Craft 2500 items.
Gather 2500 items.
Harvest 2500 crops.
Catch 1000 bugs.
Catch 1000 fish.
Chop 1500 trees.
Mine 1500 ores.
Harvest 1000 crops.
Complete 50 quests.
Sell 1500 items.
Craft 1000 items.
Gather 1000 items.
Chop 750 trees.
Catch 500 fish.
Harvest 500 crops.
Mine 750 ores.
Meet 15 Townsfolk.
Catch 500 bugs.
Gather 500 items.
Complete 25 quests.
Craft 500 items.
Meet 12 Townsfolk.
Complete 10 quests.
Sell 700 items.
Catch 250 bugs.
Harvest 100 crops.
Catch 250 fish.
Craft 250 items.
Meet 10 Townsfolk.
Sell 300 items.
Mine 150 ores.
Catch 100 bugs.
Catch 100 fish.
Chop 150 trees.
Craft 100 items.
Gather 100 items.
Sell 100 items.
Sell 50 items.
Meet 5 Townsfolk.
Meet 3 Townsfolk.